In the Database, you can select the technics you want to use in your Sudoku, whether you know it or no.

So you can learn, improve or test yourself

You can also choose the number of initialized cells in the Sudoku

They are almost 100,000 Sudokus (a little more in fact) to choose

Some informations are displayed in abbreviated form

You can color this Sudokus with a color drag & drop.

So you 'll better organize your progression

You have other options to facilitate the resolution:

With or without automated calcul of impossible candidates when a value is dropped.

With or without multiple calculation of unique or hidden candidates.

So as to generate fewer steps help

Once your choice made, valid

Or cancel to come back